D bc active transport is basically the opposite of osmosis and diffusion
The circulatory system - hemoglobin in the blood transports oxygen :)
Again :)))))
Calcium oxide:
II II
Ca O ---> CaO
water ---> H₂O
CaO + H₂O -----> Ca(OH)₂
Answer: they allow air to enter lungs and also permits air into the body
Explanation:
